Recent questions in Chemistry

Which of the following has the maximum osmotic at temperature T?

asked Feb 14, 2014 by sreemathi.v

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Mole fraction of the component 'A' in vapour phase is X and mol fraction of component 'A' in liquid mixture is Y $(P_A^0$=vapour pressure of pure A,$P_A^0$=vapour pressure of pure B) then total vapour of the liquid mixture is

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pH of a 0.1M monobasic acid is found to be 2.Hence its osmotic pressure at a given temp T is

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At room temperature $25^{\large\circ}C$,the vapour pressure of pure methyl alcohol is 92 torr.Mol fraction of $CH_3OH$ in a solution in which vapour pressure of $CH_3OH$ is 24 torr at $25^{\large\circ}$ is ?

asked Feb 14, 2014 by sreemathi.v

1 answer

At room temperature $25^{\large\circ}C$,the vapour pressure of pure methyl alcohol is 90 torr.Mol fraction of $CH_3OH$ in a solution in which vapour pressure of $CH_3OH$ is 20 torr at $25^{\large\circ}$ is ?

asked Feb 14, 2014 by sreemathi.v

1 answer

Most likely the following mixtures to be an ideal solution is

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$20 dm^3$ of $SO_2$ diffuses through a porous partition in 60 Seconds. What Volume be $O_2$ will diffuse under similiar conditions in 30 second?

asked Feb 14, 2014 by sharmaaparna1

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At room temperature $25^{\large\circ}C$,the expression for total pressure of mixture of methanol and ethanol solution is given by P(in torr)$=135+120X$ where $X$ is mol fraction of methanol,Hence

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A gaseous mixture of $O_2 and N_2$ are in the ratio of 1:4 by weight . Calculate their ratio of molecules.

asked Feb 14, 2014 by sharmaaparna1

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Calculate the total pressure in a mixture of 4g $O_2\;and \;2g\;H_2$ confined in a bulb of 1 litre at $0^{\large\circ}C$

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When mercuric iodide is added to the aqueous solution of potassium iodide,the

asked Feb 14, 2014 by sreemathi.v

3 answers

Mixture of volatile components A and B has total vapour pressure (in torr) P=$250-115X_A$ where $X_A$ is mol fraction of 'A' in mixture.Hence $P_A^0$ and $P_B^0$ respectively are (in torr)

asked Feb 14, 2014 by sreemathi.v

1 answer

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel . The weight of A is 0.50g and that of B is 0.2g. The total pressure of the mixture is 750mm. Calculate partial pressure of the two gases.

asked Feb 14, 2014 by sharmaaparna1

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Which of the following azeotropic solutions has the boiling point less than the boiling point of the constituents

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An azeotropic solution of two liquids has a boiling point lower than either of them when it

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$20\% N_2O_4$ molecules are dissociated in a sample of gas $27^{\large\circ}$ and 760 torr. Calculate the density of the equilibrium mixture.

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Which is true about enthalpy of solution containing benzene and toluene?

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The degree of dissociation $'\alpha'$ of a weak electrolyte is (N is number of ions given by 1 mol of the electrolyte)

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If $10^{-4} dm^3$ of water is introduced into a $1.0dm^3$ flask to 300K. How many moles of water are in the vapour phase when equilibrium is established? (Given Vapour pressure of $H_2O$ at 300K is 3170 Pa ; $R = 8.314JK^{-1}mol^{-1}$

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Which of the following has maximum freezing point for 1 molal solution, assuming equal ionisation in each case?

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The ratio of the rate of diffusion of helium and methane under identical conditions of pressure and temperature is

asked Feb 14, 2014 by sharmaaparna1

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The root mean square speed of one mole of a monoatomic gas having molecular mass M is $U_{rms}$. The relation between the average kinetic energy (E) of the gas and $U_{rms}$ is:

asked Feb 14, 2014 by sharmaaparna1

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One mole each of the following solutes are taken in 1000g of water

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Positive deviations from ideal gas behaviour takes place because

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Lowering of vapour pressure due to a solute in 1 molal aqueous solutions at $100^{\large\circ}C$ is

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When the temperature is increased surface tension of water

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Match the column-I with column-II ,which are true for 20% w/w aqueous KI solution (density of KI solution is 1.20g/ml & M.wt of KI is 166 g/mol)

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Match the column-I and column-II

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Which is true about ideal solutions?

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Total vapour pressure of mixture of 1 mole $X(P_x^0=150torr)$ and 2 mol Y$(P_y^0=240torr)$ is 210mm.In this case

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Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 4.0mole of benzene and 6 mole of toluene in solution.

asked Feb 14, 2014 by sreemathi.v

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Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is

asked Feb 14, 2014 by sreemathi.v

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Mole fraction of the toluene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is

asked Feb 14, 2014 by sreemathi.v

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A $1.37\; M$ aqueous solution of citric acid ($H_3C_6 H_5O_7$; Molecular Weight = $192.1 g/mol$) has a density of $1.10 g/cm^{3}.$ What is the molality and mole fraction of the citric acid?

asked Feb 13, 2014 by sreemathi.v

1 answer

What is the molarity of 0.60N $H_3PO_4$ (a tribasic acid)in the following reaction?$H_3PO_4+2OH^-\rightarrow HPO_4^{2-}+2H_2O$

asked Feb 13, 2014 by sreemathi.v

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What is the normality of 0.20M $H_3PO_4$ (a tribasic acid)in the following reaction?$H_3PO_4+2OH^-\rightarrow HPO_4^{2-}+2H_2O$

asked Feb 13, 2014 by sreemathi.v

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The freezing point (in$^{\large\circ}C)$ of a solution containing 0.1g of $K_3[Fe(CN)_6]$ (mol .wt .329) in 100g of water $(K_t=1.86Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

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Dissolving 120g of urea (mol.wt.60) in 1000g of water gave a solution of density 1.15g/ml.The molarity of solution is

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For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $4^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $2^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

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98%(w/w) $H_2SO_4$ stock solution has a density of 1.8gm$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume(ml) of stock solution required to prepare a 1800ml of 1.0N $H_2SO_4$ is

asked Feb 13, 2014 by sreemathi.v

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29.2%(w/w) HCl stock solution has a density of 1.25g$ml^{-1}$.The molecular weight of HCl is 36.5$gmol^{-1}$.The volume (ml) of stock solution required to prepare a 500ml of 0.1M HCl is

asked Feb 13, 2014 by sreemathi.v

1 answer

98%(w/w) $H_2SO_4$ stock solution has a density of 1.8g.m$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume (ml) of stock solution required to prepare a 450ml of 1.0M $H_2SO_4$ is

asked Feb 13, 2014 by sreemathi.v

1 answer

98%(w/w) $H_2SO_4$ stock solution has a density of 1.8g.m$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume (ml) of stock solution required to prepare a 900ml of 0.5M $H_2SO_4$ is

asked Feb 13, 2014 by sreemathi.v

1 answer

The root mean square speed of an ideal gas at constant pressure varies with density d as

asked Feb 13, 2014 by sharmaaparna1

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$29.2\%$(w/w) $HCl$ stock solution has a density of $1.25gmL^{-1}$. The molecular weight of $HCl$ is $36.5g\;mol^{-1}.$ Find the volume $(ml)$ of stock solution required to prepare a $200\;ml$ of $0.4\;M\; HCl$ is

asked Feb 13, 2014 by sreemathi.v

1 answer

At $100^{\large\circ}C$ and 1 atm , if the density of liquid water is 1.0g $cm^{-3}$ and that of water vapour is $0.0006gcm^{-3}$ , then the volume occupied by water molecules in 1 litre of stream at that temperature is :

asked Feb 13, 2014 by sharmaaparna1

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A 5.0 molal aqueous solution of methyl alcohol,$CH_3OH$ is supplied.What is the mole fraction of methyl alcohol in the solution?

asked Feb 13, 2014 by sreemathi.v

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The rms velocity of hydrogen is $\sqrt7$ times the rms velocity of nitrogen. If T is the temperature of the gas, then

asked Feb 13, 2014 by sharmaaparna1

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Ethylene glycol is used as an antifreeze in a cold climate.How much mass of ethylene glycol should be added to $5\;kg$ of water to prevent it form freezing at -$6^{\large\circ}C$ will be : $(K_t$ for water =$1.86Kkg mol^{-1}$ and molar mass of ethylene glycol=$62g mol^{-1})$

asked Feb 13, 2014 by sreemathi.v

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